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Series 4 are larger machines that can host a part of an A.I. Mack used machines of this series to protect Harvest as long as possible.[1] The series 4 Gondolas collect crops from the sides of the machines. Johnson and Byrne used one of these to provide a distraction while they snuck up on the recruits in Halo: Contact Harvest.

Series 5 are larger machines that can host a part of an A.I. Mack used machines of this series to protect Harvest for as long as possible.[1] The series 5 Gondolas collect crops from the rear of the machine. It is powered by a three thousand horsepower ethanol-electric engine.

One of the prototypes was on a Humanfreighter, This End Up, commanded by Henry "Hank" Gibson, who was killed in the resulting fight with the Covenant. When the Covenant attacked the vessel, the HuragokLighter Than Some saw the prototype and built four vehicles based on it that would be later known as the Chopper, which is also later known as the "Brute Chopper" later in the Human-Covenant War.

The machine Gibson was carrying was a massive machine designed to till wide swaths of earth. It has six massive wheels and a large beam with spikes on the front to carry around the earth.

After being ordered by Sadie Endesha to commandeer city transportation to move an 800-pound man named Jonas, New Mombasa's Superintendent pulled schematics out of its database depicting an Olifant (a variant of the UNSC's standard Elephant HRV) labeled with a Jotun insignia, indicating that Jotun Heavy Industries may be responsible for producing both Olifant garbage trucks and the larger Elephants as well.